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Restructuring and Excess Facilities - Activities in Restructuring Accrual (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2011 Excess Facilities [Member] | Dec. 31, 2010 Excess Facilities [Member] | Dec. 31, 2012 Excess Facilities [Member] | Dec. 31, 2011 Excess Facilities [Member] | Dec. 31, 2010 Excess Facilities [Member] | Dec. 31, 2010 Campus Consolidation [Member] | Dec. 31, 2010 UK Closure [Member] | Dec. 31, 2011 Scopus Facilities [Member] | Dec. 31, 2010 Scopus Facilities [Member] | Dec. 31, 2009 Scopus Facilities [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 2,593 | $ 2,920 | $ 5,332 | $ 2,862 |  | $ 2,593 | $ 2,862 | $ 3,117 | $ 1,715 | $ 276 | $ 58 | $ 224 |
Provisions (recoveries) | 94 | 517 | 2,991 | (517) | (3,061) | 94 | 517 | 3,061 | (2) | (71) |  | 3 | (8,300)
Cash payments, net of sublease income | (1,818) | (844) | (5,403) |  |  | (1,818) | (786) | (3,316) | (1,713) | (205) | (58) | (169) |
Ending Balance | $ 869 | $ 2,593 | $ 2,920 |  | $ 2,862 | $ 869 | $ 2,593 | $ 2,862 |  |  |  | $ 58 | $ 224

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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